package com.example.lotterysystem.service.activitystatus.impl;

import com.example.lotterysystem.common.errorcode.ServiceErrorCodeConstants;
import com.example.lotterysystem.common.exception.ServiceException;
import com.example.lotterysystem.service.ActivityService;
import com.example.lotterysystem.service.activitystatus.ActivityStatusManager;
import com.example.lotterysystem.service.activitystatus.operator.AbstractActivityOperator;
import com.example.lotterysystem.service.dto.ConvertActivityStatusDTO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
@Slf4j
@Component
public class ActivityStatusManagerImpl implements ActivityStatusManager {
    @Autowired
    private ActivityService activityService;
    @Autowired
    private final Map<String, AbstractActivityOperator> operatorMap=new HashMap<>();
    @Override
    @Transactional(rollbackFor = Exception.class)
    public void handlerEvent(ConvertActivityStatusDTO convertActivityStatusDTO) {
        //1、活动状态有依赖性，导致代码维护性差
        //2、扭转条件可能会拓展

        if (CollectionUtils.isEmpty(operatorMap)){
            log.warn("operatorMap 为空");
            return;
        }
        //map<String,AbstractActivityOperator>:
        Map<String,AbstractActivityOperator> currMap=new HashMap<>(operatorMap);
        Boolean update=false;

        //先处理人员、奖品
        update= processConvertStatus(convertActivityStatusDTO,currMap,1);

        //后处理：活动
        update=processConvertStatus(convertActivityStatusDTO,currMap,2)||update;

        //更新缓存
        if (update){
            activityService.cacheActivity(convertActivityStatusDTO.getActivityId());
        }
    }

    @Override
    public void rollbackHandlerEvent(ConvertActivityStatusDTO convertActivityStatusDTO) {
        //operatorMap:活动、奖品、人员
        //回滚活动
        for (AbstractActivityOperator operator : operatorMap.values()) {
            operator.convert(convertActivityStatusDTO);
        }
        //缓存更新
        activityService.cacheActivity(convertActivityStatusDTO.getActivityId());
    }

    private Boolean processConvertStatus(ConvertActivityStatusDTO convertActivityStatusDTO,
                                         Map<String, AbstractActivityOperator> currMap,
                                         int sequence) {
        Boolean update=false;
        //判断遍历currMap
        Iterator<Map.Entry<String, AbstractActivityOperator>> iterator = currMap.entrySet().iterator();
        while (iterator.hasNext()){
            AbstractActivityOperator operator = iterator.next().getValue();
            // Operator是否需要转换
            if (operator.sequence()!=sequence
                    || !operator.needConvert(convertActivityStatusDTO)){
                continue;
            }
            // 需要转换：转换
            if (!operator.convert(convertActivityStatusDTO)){
                log.error("{}状态转换失败！",iterator.getClass().getName());
                throw new ServiceException(ServiceErrorCodeConstants.ACTIVITY_STATUS_CONVERT_ERR);
            }
            //currMap 删除当前Operator
            iterator.remove();
            update=true;
        }
        // 返回
        return update;



    }
}
